Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b433749778d85e6db30977d6db316a3bdd8ff47bece653c8764df60925631f' 
  AND token = 'nvyO16UlGcb4KFNon2pwMUjBXmw3GpbpLKe3TrqhHo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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