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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb451216cc991b544b5c2d381f677f479c48ed73c77b703d97198205ec7f4971' 
  AND token = 'lD41XqVeEWFhopGWUYo0Ex3imxTlLbYiknS5mcAcHb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}