SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '105c116fa21942fd9ff9be88e9ca6a301f61c61414a0524e67c4bc320fdc5da6' 
  AND token = 'XUBv2U+/V7Shb37mYYJa+lQcG5haMPH4Bv8bO6uqjCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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