Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b0d972eaf20f62825fec9f2fecdc767c56c520c204bdff50dfb4c001faca2a' 
  AND token = 'TMJ+TtYzzotY3rjDXBg/8SF9tPot1QeLbrwPSS1p1kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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