SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb210bf98317f5670c715c9590d31d5998fbfb988a21c5b34f77d113c222073' 
  AND token = 'WnGdvwC5GRxK5jnDSZvIzPiULvWr71AF+wGyiGgJXE8=' 
  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"
    }
  }
}