SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1695c89c17132f4aa3a2823af42f03564e4121cdc25339d1ad769257942ca675' 
  AND token = 'NSZqOOFxS/yDcI2aToKIGwbNjzBKKMZ8VyIQGwMlnhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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