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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ba6a0c8503321bdbdc9cf39de2c7cb7c87afbb8ed1f2cd4794dd56941b7ce6' 
  AND token = 'bpYBIIckkZpU3nNQOLVPTbMhMEB19GhBbR/U3KmiUac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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