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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a5d43a24a2d9457f69c6fa21d9b5223df14460f0e56c93bdd47d248384fe3c' 
  AND token = 'DgEOlZdyf6lA1jdfwIrgISTGtcHZV2rLQ1rVBbW5eXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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