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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21fe65cd69424518518d133cf0f0d32dbdae6949154854e10956f2127504d53b' 
  AND token = 'yCgDVdncNOays9rxBQL2BEPOjo5/PUBkrr3atTI3zrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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