SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662a0c458530662d4188cb502f385aabfac61f6d6fab3dca2df5040d26779fe0' 
  AND token = 'l9YuMZbPJwJWWAmq8FUUGNpZgP9NJlmWZox45iqhFQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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