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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f1b7884bc78cebff77492f70cb0687e57a9a6fd12fb157d4a7877e28817a5f' 
  AND token = '+iwD2B8TYuxTdfD/P/6qTIqSV3Bb6/j1PbMnc8h8Ogk=' 
  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"
    }
  }
}