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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '678e13fdbc2ed0b393dc1876a6be5c96f0827a8ad43620d770707d7b0d72bc71' 
  AND token = '3Zrqioh3uXciHZGaIJGOdV9nn51ReqW04LM8CyNqywU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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