Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d844f006af42fa71ed9cb05879dbe490c3f59af84087046829e880c95d57998' 
  AND token = 'vJhhOJSqN9S2UFDAGlnnf3kQSqtnF5Dt4EP9Do+0tZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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