SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b382a5b6e3ff0d9137f9029a8ccf291d717a4e2daebc4a967bae63dbb80064' 
  AND token = 'sh5nW0jILDFLOJQR+Dzfna8PPLHgQvjJSjiTa9w3pDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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