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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0984ed540f79ad854bbfaa6a89a3731cf7eff27ef8d1eeea2e4d47f04eefc2ce' 
  AND token = 'QW5tIhUiW06PT5NFAL5CqY3bG3Gi/AwU+OXEceBpyiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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