SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed33b3319669f8e096a01041ab55948794b858a5209644d525b8c47812330118' 
  AND token = 'yuz3ayJDWktiC7U+xBPnMO4zUKjWhJYJnfLaZuDXYkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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