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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b12f622f9e46d1eca2882629cc121b570e44d94ea3703b7ae0279bdcae4438' 
  AND token = 'ZCSCfQrlOJqTT+Yt4vWWmvcwceFvW/zymuAYkRtvG1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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