Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47717fd38ec6708b0159a1cb87244e74b047b3ef529198eefdbedda614b2c98' 
  AND token = 'TVQmaxkVuSHa/bRkzPDM3Ym49iph+e9di1Ng/Q51GvE=' 
  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"
    }
  }
}