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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6935bbab65d6a799d2464dd0795c21b8404955f09eddccd5ac17a359a25309' 
  AND token = 'tFPe3ZdFllP5YH3KJgE09zAA9VfwmEIh8ov/SeGrwrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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