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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5f721077b52e8e02d6c3f08c86bb8b3b1ac7393d768393c159ac4ec8b5d029e' 
  AND token = 'tWJ/b5nk1ekhUVvQ4Jy+Sf8xfywpRmPojF4Ui6aJOng=' 
  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"
    }
  }
}