Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf02ee23543f3bce865a772fefd26d74a28af129b968fff095c6d8311c04993' 
  AND token = 'fIv67O3BcZLNAkpdg7kqIkItxyNA+LGYCh51OqXBNB8=' 
  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"
    }
  }
}