SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b179f5f0627920271b37787fb175ac56f139b34e7165b68e6f769a59256608f1' 
  AND token = 'wIkUUoNQBhMJpcFXR1yhh/9nIawCyHVM9jtGwhGCU1g=' 
  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"
    }
  }
}