Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d64d1315ab04a6e6b8c837cea434915f47079a37c4fdac0d28e51d41a8b66b' 
  AND token = 'xyZWzlRZpVltBaXMLOL0zKmj1SlYZA2DsCD1aPH4U0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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