Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fdca9c31fba4b9e34872180b2197ffe9b17ea5ac4dad18cc6f3097417a6f229' 
  AND token = 'p4MrW6G4ClSAOShnwB9ymOvc7YIVtqDMstDN49R3lVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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