SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61734df7ea6bc3d906923de81d91b254cab361c4816fc388de1cf65705f16e1e' 
  AND token = 'zuQVABbjQ0qzRfow3knvOvZJVhC2phF+ANIIJFYIlfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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