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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808dd110943e50c40028c0a6d0f579c8c6822ac017cd4c87c8fc8c5ca32fccfb' 
  AND token = 'CdtD5qKz93DwFFLIFwF6eeEez/VdMfP/28yBgwfVnUc=' 
  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"
    }
  }
}