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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '966358e5a9a2f0cf544eb6cc6451339c7fb74d3e7d0877d750d3fb51391a368e' 
  AND token = 'XtCuICDp4mHckbUVUG+10sqMBdg/Fl1t30bDG/33Y1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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