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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6d29a65ad3abc3fa0e93af46dfdbee8db8f18547d6499d049f7b458361de86' 
  AND token = 'Nq9kEWVBD/yiLFU0vte4OqgyYkFQBgKSsROyvpfL7QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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