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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df8a3f630b07b491918f4ac02f7077a9598d66006f336b7ebe287a7166ef6a8' 
  AND token = 'gm3dMBebzwg7PT6Ilpo1IAGEjB3G0Z1w/zedbE8W/GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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