Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52152388dc40db3f04473ebacd2b8178226d5a7085dc2e7fc5c26e5b8b30488b' 
  AND token = 'QtgOt9j7vo85FP7ocEyqiAF9cdZUHILSuawxB2HRArs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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