Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c614c92eda3b74405100e9bd4d38634547619f936b338610d3fd9df8e815553a' 
  AND token = '3t6yoK4GqdfFqeksDio/dutz8mmCx99Dw7BMFP6mSx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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