Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8215cf8db01be6afc60b5251696eb481a38a020f16dc4b788ade58eb5f87f223' 
  AND token = 'XiqYua+BBDU66w6Nb1RgBV8HMMT2Ua6/7YmRWBTD0m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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