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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9454304642e83ce03ae56e6eb4b83e1023b75c6cb12d20152d967aa48ee89e' 
  AND token = 'qzZdpjJBzb9hCyWnbwFZqYt1cpY3p8XWuxzUqjwsUmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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