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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a5af3777664217e2cadf7b1fe5146a300c7e5afdfd832c6711010b8e877312f' 
  AND token = 'VvcaKbcdo+7Sen7iaA/2SOGmEywtASvW0MqjR8rDJDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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