SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28599204fb89d8a91f15ecdc8d895d31e2c0a1279c153453146cc16b5edfba1' 
  AND token = 'GVvDzrREX+07l6/YF2OoYKMCq+WRpM6hfi+rBDy4G10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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