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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7257b90ceff390db9f902b9214ab3abab222532a49fe1f6e29103baae4a57cdc' 
  AND token = 'E2DjQvZghcxIIJcg4kHkIg3BgmemNNziy0uTRi24kV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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