Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993b5c4c27e60a0626c43bd544e50a5d3999085b108064cf1d459b0ce640810c' 
  AND token = '+vZ/yJwHgtZk3RxJXc15R0uWOe32PF2yGZvqlIRvhQM=' 
  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"
    }
  }
}