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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b0cf0b84c183e8a538d395809e2891024d54ba7da2f85c40aa5cdeedaa9a23' 
  AND token = '2AtYMpOVPuQaeKOL6xNjbZVTUouDf/APGo4zvv03Tpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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