SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba8de37785da0bf036b4ad42ded933fe34559479716148f6859d7f2d8117893' 
  AND token = 'F1tkUBOKjzpDZ+/EHu8YziG9YxW16cHiwCq+0urYshc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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