Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cfb283f3521a21f2d3297695cee911d81e12cb2ea711ee663d1ed7f2b579621' 
  AND token = 'mUkCuEgrSBzNxHEvpbnYUmItg7G4Ai0uo+tiV+ITO/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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