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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6fd63990f3c326ff1ab78aea5c5ff29506964d8aea22c8427b1758dfeae450e' 
  AND token = 'Lg+dxjWxD4otb/r6UTgZk2GA65jTJ+LH/9RMJ5d++7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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