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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a84b1e7711a7ceb6372e5f59ee8ae00d25294b98f423aa545e23bc146b61a8' 
  AND token = 'jOHMEgOlCTty8pEGMcS6gqgAOQ6kC8bzxLFsrzuQI9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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