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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ee90c0897e00eed2c587d02335a27707c57e192627d56c013d7876ea8252c5' 
  AND token = '5YRfcTFh/OR2SQa3ZMHJT0zRV9KHrO3qL9FcRemi7b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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