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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda53e36c90258516ac5b813f7edc75d817930436156f8839d497f0334aeddde' 
  AND token = 'VugVXlcXciqs4ubRJ2VRGKzQ1f3RZNae1X6pad6J6wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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