Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb6962d4daa42559084022d3adf47c2385c4d819e42ccf43368f7a0afd0b69c' 
  AND token = 'N1gbDCFxQr0qlysd1NnEKdHwkDSP1x3AuzLVg65l8Vs=' 
  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"
    }
  }
}