SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be404cd82905417df54424a4a013e1f7a88ea27da2e25dcd2fa61c5f36d99dec' 
  AND token = 'uDUy5qJ8hDJjp6VCxhRHIGX8l2vhKoFSVC7TepRI/SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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