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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e254a6b6f9ca7f864dca20cae4574bc920bf2564de345e7fce7138dd6c324d5' 
  AND token = 'vk78gPUOlyZj/QZIUkr7RVPwjq1IRpiDOWdC9w8Escc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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