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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438bfe9446bdc9d2b1a79d6d86875c2956dbcc87549c9872b52f6e42599fb99f' 
  AND token = 'kGW5DMpg84Klt2ltytQe+w8NfE8p6H5JimcIeD5t6Og=' 
  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"
    }
  }
}