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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c4345d8c8caef62d516085da415eca7a807a601973dd3d807e3459c415cab8' 
  AND token = 'drV2KJdzOH4iQ4v7OtCrOL9YIGW0HqM+WEAd27UfNXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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