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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bea7305550def031cfe0f0d7f609714500b1a8b230d57246074dd3af1291ed8' 
  AND token = 'ANaGWvoN7l7HA3McR13fbKfok8gLLhe5OUylyd8A318=' 
  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"
    }
  }
}