SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d4c6131a6fbd2667b0b51e689a088bd253b98cffd0ecc8e6739c02681959d0' 
  AND token = 'vdjLJE9YJAA2XLEN+k92+UbhZlBObH6ndGjAiLquPSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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