Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de7697bf3fcf25f37d7f1f9d2f5e4df9ebd6c867cd3a80d7e5553e2248eb486c' 
  AND token = '/CuejiPF719DEATxmpQBDws5EaePsFsmqnbbI3KaSKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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