SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760bcc1b69e25bd6a1b8b8ef9057740e63d2632c67503405042fa9d9c5a1c1ae' 
  AND token = '3HQ9WQlT3Ez4Rv/v5lbxq7nAO6R9BZG7wXDwVmwkgPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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