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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926a4ec7563e9d8c914f34e9067d0fd4b321edeba57c51223e37478179306c43' 
  AND token = 'Ykg6TQLDom9mhSde0T9/wJ87FrXo//8/4B6a+PJm/ys=' 
  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"
    }
  }
}